A seven-star energy-efficient home built today is designed based on outdated weather data, and as the climate warms, will only provide the comfort of a tent by 2070.
As the climate warms, the amount of energy needed to cool homes annually will double by 2050, the reportfound. This means a home that appears efficient today would no longer perform well in future, and would have a lower star rating.Experts called on governments to update the data so that homes fit for future purpose can be built while reducing emissions and pressure on the energy grid.
Sweltering Cities executive director Emma Bacon also warned of the risk to Sydney, as heatwaves – the deadliest environmental disaster – increase in frequency and severity.Rob McLeod, policy and advocacy manager at Australian non-profit organisation Renew “We looked at how hot would get without an air conditioner. A home that is built today at seven-star ratings will have the same temperature during a hot summer day in 2070 as one of those 1.1-star rental homes does today,” McLeod said.
Because western Sydney was a growth area, it was more likely to have newer homes built to the seven-star standard, Upadhyay said.
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